Uniform Size of 50 Caliber. Fit For Umarex Tr50, HDP50, HDR50 Perfectly. Top Class Aerial Aluminum Alloy Crafted. 100% Perfect Symmetrically Round With NO Flaws. It's An Easy Glass Breaker. More Powerful Than Plastic Nylon Kinetic Rounds And Rubber Balls. Fly Faster And Farther Than Steel Balls. Weighs More And Hits Harder Than Nylon Balls. Significantly Round, Silver Color, Smooth Finish, Seamless, Mirror Polishing For Maximum Impact and Best Penetration. Great for Target Practice , Recreational Shooting And Home Defense. Fly Straight, Hit Accurate And Never Get Jammed. Very Reusable, No Shattering With Steel Targets. No Deforms When Hit Concrete Blocks Or Plywood.